51L Iron Ore Hoppers

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Wizard of the Moor
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Re: 51L Iron Ore Hoppers

Postby Wizard of the Moor » Sun Apr 26, 2020 2:51 pm

Terry Bendall wrote:Stenson Models do a useful range of handwheels which are very nice.


Indeed they do and I have a good selection in stock, but none that match the size of these ones.

Actually, 51L do some frets of handwheels that are much better than these ones.

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Wizard of the Moor
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Re: 51L Iron Ore Hoppers

Postby Wizard of the Moor » Sun Apr 26, 2020 4:27 pm

A cruel (no, what's a couple of stages on from cruel?) close-up showing the state of these handwheel etches.

BF2C8096-4016-4CD7-B07F-8834BCC9603E.jpeg


Top row: those from a 2nd generation etch, soldered to shafts, cleaned up by spinning in the Dremel against fine wet and dry paper, then lightly dished. The one at the very right needs another polishing session! You can see that not all of the polygonal surfaces have been blended in.

Middle row: those from the 1st generation etch. How do I know that? Well, the placement of the components was different. These look a bit chunkier to me.

Bottom row: those from the other second generation etch. The amount of mismatch between the two halves of the photo tool is very evident. I think these are for the scrapbox, to be honest.

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Wizard of the Moor
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Re: 51L Iron Ore Hoppers

Postby Wizard of the Moor » Sun Apr 26, 2020 9:19 pm

Having got the handwheels polished to my satisfaction/limit of attention span, they were added to the hopper door cross-shafts and then fixed to the underframes.

7EB4F585-2190-41BE-8BFE-D0864CCBCC90.jpeg


This shot highlights the ends of the outer vee hangers sitting in mid-air, rather than being just below the bend in the brackets fixing them to the solebars. I should have trimmed the top edge off the solebars before fitting them and then made up new brackets. Ah well, theres always next time :cry:

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Wizard of the Moor
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Re: 51L Iron Ore Hoppers

Postby Wizard of the Moor » Sun May 10, 2020 1:38 pm

I see that there have been 1883 views of this thread, so time for another update.

Andrew from Wizard Models has been very helpful (as always!) in helping me understand the castings for the hopper door control gear. You may remember this picture, where I highlighted the two different casting shapes that were in my kits.

EBE47428-8D5D-4160-BBBD-2798A5A9CBD8.jpeg


The castings on the bottom right are the correct ones. The triangular part to the left of the bracket represents the semi-circular plates that lock the door open. Geoff Kent mentions adding these in his MRJ article, so the 51L moulds must've been updated at some point to better represent this. New castings arrived very quickly in the post.

I still felt, though, that the two plates need to be included. These were marked out on a 3mm x 0.25mm strip of nickel silver from the useful Palantine Models etch. I guesstimated the curved part to be 2.6mm tall, 3.5mm wide and a radius of 4mm seems to work ok. There is a lug at the top, which I made 0.5mm square.

7653A15D-00F6-4335-8625-559CB8AFEE86.jpeg


These were roughed out with jeweller's snips and then filed to shape. The castings have a very pronounced draft, so I used a curved scalpel blade to scrape this back a bit so that the plates would stand vertically. The new plates could then be Loctite'd in place. The photo attempts to show the marked out plates, the draft of the castings, and a finished unit.

Holding such small pieces to shape them accurately is always a challenge. Seeing the lines to file to is even more so. By adjusting my vice to hold the parts at a comfortable attitude and arranged to catch the light, the filing process wasn't too bad. I even managed to avoid feeding the carpet monster on this occasion.

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One further point about these castings: they are intended to be fixed to the underside of the wagon top-plate such that the bracket assembly pokes up into the holes in the top-plate. Before fixing, cut about 3mm from each end of the bar, otherwise this will impede the bearing carriers. As I've moved the spring position 1mm further away from the wagon floor than intended, this would just impede the spring movement. If built as designed, the ends of the beams will try to occupy the same space as the tops of the bearing carriers. This is pretty obvious, but not called out directly in the instructions.

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Wizard of the Moor
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Re: 51L Iron Ore Hoppers

Postby Wizard of the Moor » Sun May 10, 2020 6:37 pm

Having dealt with all the hopper door control castings, I decided it would be a good idea to work out how the hopper bodies should be attached to the underframes. There is no provision in the kit for getting the two aligned. Geoff Kent describes how he used a rectangle of 20 thou platic card glued onto the bottom of the hopper to engage with the central hole in the top plate. I've done similar, but with nickel silver, as it was the first sheet of the right thickness to come to hand.

DB7C883D-FB90-4CBD-AA59-6C5E95EBF35D.jpeg


I found it really tricky to mark out the bottom of the hopper, as there are no right angles anywhere to run the leg of my calipers along. Anyway, a little perseverance and everything worked out fine. The hoppers can now be put in position to check clearances for the next stage, which is the operating handles for the door.

One of the hopper castings was warped, so a quick dip in some hot water to soften it, then holding it on the base of a flat container and pouring cold water on it sorted that. And then again and again and again to try and correct the bowing that developed in the sides :cry: Next time I'll ask Andrew if he can sell me a replacement casting.

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jim s-w
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Re: 51L Iron Ore Hoppers

Postby jim s-w » Wed May 13, 2020 12:21 pm

Despite all your tribulations this thread is ticking my awkward kit interest. Tempted to get one now! :D :D


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